کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
655620 1457654 2011 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Conjugate conduction-natural convection in an enclosure with time-periodic sidewall temperature and inclination
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
Conjugate conduction-natural convection in an enclosure with time-periodic sidewall temperature and inclination
چکیده انگلیسی

The unsteady conjugate conduction-natural convection in enclosure is of great theoretical significance and is widely encountered in engineering applications in the areas of fluid dynamics and heat transfer. However, there are relatively few efforts to investigate the unsteady flow physics and heat transfer characteristics in the inclined enclosure of finite thickness walls. In the present work, this problem is numerically investigated by a high accuracy multidomain temporal–spatial pseudospectral method. The enclosure is filled with Boussinesq fluid and is bounded by four finite thickness and conductive walls; one of the vertical sidewall is exposed to time-periodic temperature environment while the opposite sidewall holds constant temperature; the top and bottom walls are assumed to be adiabatic. Particular efforts are focused on the effects of three types of influential factors: the wall thermophysical properties, the time-periodic temperature patterns and the inclination, and the time-periodic flow patterns and heat transfer characteristics are presented. Numerical results reveal that within the present parameter range, the heat transfer rate increases almost linearly with the thermal conductivity ratio and thermal diffusivity ratio but decreases with the inclination angle. Moreover, the heat transfer could be enhanced or weakened by selecting different temperature pulsating period in the case of finite thickness wall, while it is always enhanced if the walls are zero thickness. The back heat transfer and heat transfer resonance phenomena are observed, and their relationships with the time-periodic flow patterns and temperature distributions are analyzed. The findings are helpful to the understandings of the fluid flow and heat transfer mechanisms in the related enclosure configurations, and may be of engineering use in thermal design improvement.

Research highlights
► Wall thermalphysical properties are significant to heat transfer performance.
► Heat transfer rate is more sensitive to wall thermal diffusivity coefficient.
► Heat transfer is enhanced under specific wall temperature pulsating period.
► Natural convection heat transfer is strongly related to enclosure inclination.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Fluid Flow - Volume 32, Issue 1, February 2011, Pages 52–64
نویسندگان
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